CT dose reduction using Automatic Exposure Control and iterative reconstruction: A chest paediatric phantoms study |
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| Institution: | 1. Department of Medicine, Division of Cardiology, Columbia University Medical Center and New York-Presbyterian Hospital, New York, New York;2. Department of Radiology, Columbia University Medical Center and New York-Presbyterian Hospital, New York, New York;3. Department of Radiology, University of California, San Francisco, San Francisco, California;4. Department of Biomedical Engineering, University of California, San Francisco, San Francisco, California;5. Department of Imaging Physics, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, Houston, Texas;6. Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts;7. Department of Radiology, Mayo Clinic, Rochester, Minnesota;8. Department of Radiology, University of California, Los Angeles, Los Angeles, California;1. Department of Radiology, Charité School of Medicine and University Hospital, Charitéplatz 1, 10117 Berlin, Germany;2. Department of Radiation Oncology, Charité School of Medicine and University Hospital, Augustenburger Platz 1, 13353 Berlin, Germany;3. Department of Radiology, Jena University Hospital, Erlanger Allee 101, 07747 Jena, Germany;1. Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California;2. Department of Imaging Physics, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, Houston, Texas;1. Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan;2. Department of Radiology, Kobe University Graduate School of Medicine, 7-5-2, Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan;3. Diagnostic and Interventional Radiology, University Clinic Heidelberg, Im Neuenheimer Feld 110, D-69120 Heidelberg, Germany;4. Department of Radiology, Brigham and Women''s Hospital, 75 Francis Street, Boston, MA 02115, United States |
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| Abstract: | PurposeTo evaluate the impact of Automatic Exposure Control (AEC) on radiation dose and image quality in paediatric chest scans (MDCT), with or without iterative reconstruction (IR).MethodsThree anthropomorphic phantoms representing children aged one, five and 10-year-old were explored using AEC system (CARE Dose 4D) with five modulation strength options. For each phantom, six acquisitions were carried out: one with fixed mAs (without AEC) and five each with different modulation strength. Raw data were reconstructed with Filtered Back Projection (FBP) and with two distinct levels of IR using soft and strong kernels. Dose reduction and image quality indices (Noise, SNR, CNR) were measured in lung and soft tissues. Noise Power Spectrum (NPS) was evaluated with a Catphan 600 phantom.ResultsThe use of AEC produced a significant dose reduction (p < 0.01) for all anthropomorphic sizes employed. According to the modulation strength applied, dose delivered was reduced from 43% to 91%. This pattern led to significantly increased noise (p < 0.01) and reduced SNR and CNR (p < 0.01). However, IR was able to improve these indices. The use of AEC/IR preserved image quality indices with a lower dose delivered. Doses were reduced from 39% to 58% for the one-year-old phantom, from 46% to 63% for the five-year-old phantom, and from 58% to 74% for the 10-year-old phantom. In addition, AEC/IR changed the patterns of NPS curves in amplitude and in spatial frequency.ConclusionsIn chest paediatric MDCT, the use of AEC with IR allows one to obtain a significant dose reduction while maintaining constant image quality indices. |
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| Keywords: | MDCT Automatic Exposure Control Radiation dose Children Iterative reconstruction |
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